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After SHF_ALLOC sections are ordered by LMA: * If initial sections are empty, GNU objcopy skips their contents while we emit leading zeros. (binary-paddr.test %t4) * If trailing sections are empty, GNU objcopy skips their contents while we emit trailing zeros. (binary-paddr.test %t5) This patch matches GNU objcopy's behavior. Linkers don't keep p_memsz PT_LOAD segments. Such empty sections would not have a containing PT_LOAD and `Section::ParentSegment` might be null if linkers fail to optimize the file offsets (lld D79254). In particular, without D79254, the arm Linux kernel's multi_v5_defconfig depends on this behavior: in `vmlinux`, an empty .text_itcm is mapped at a very high address (0xfffe0000) but the kernel does not expect `objcopy -O binary` to create a very large `arch/arm/boot/Image` (0xfffe0000-0xc0000000 ~= 1GiB). See https://bugs.llvm.org/show_bug.cgi?id=45632 Reviewed By: jhenderson Differential Revision: https://reviews.llvm.org/D79229
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